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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb77d59be4dcb9c8afcae0dfcd2de442335b3d882282c797b68d813ca484960' 
  AND token = '3SP8C8JN2HCsRCfexUHm/u2q6fSVqB/ZZ0Uxx2/zFE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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