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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f345bb1a3176ffe9839a49281faa26401c8f8ddaf375037c89ebc1dff5fc0bb' 
  AND token = 'bph0IhpSv/27fMM6i/2/H2aUV+3cvZ+0LG10cm59ZzI=' 
  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"
    }
  }
}