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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '729f7be0593d91b7ae197ed5eca232dd0dccfad39fe21217682559e1d0e325e7' 
  AND token = 'F/dCS2+fZxHDjmpRBWs3MpepqteA/DFPvaSD9aoSYHc=' 
  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"
    }
  }
}