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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540a8bbeb789e2e2d137096512b28421f79e7669377c8c2c58300724a641c553' 
  AND token = 'cGCR7+ehBjbtR3M40GSoVPokrwqwa8fHShJEvNDiKNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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