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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5b642d410c2eaca07d434639d613cace84487df07db84208df9f48c1003b2c' 
  AND token = 'P76jSy3IT+BbBOmrSbf90HWnkx79m3aYc5uD50x1blY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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