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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f36ccd2b1144b487117399e7d3f22d70fcb9592bd8d32fc12714808f20eb6d0' 
  AND token = 'VrX83gKfaFXA1oH/fxP3pKbcT3f1+0WNMBGCzITvmCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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