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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4af1e7ce300ca09c990b79ccf0e3689fa0e459e4827a0e5b426041954b1704' 
  AND token = 'sK4z/w0+A/MeNOBo+67GF09POamM/IyGMO34JtxQkB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}