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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e847c4b5090ca09a5b31f1f947f2d5f086e96116d60bf556da24a5de2d958984' 
  AND token = 'V2atnRjbIRBGLgf3xPeakPSIxszVS5jrm77J45ENgVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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