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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc265b57ecc5fa53f2a2b84136968f6e2d0b4f739465ee8bfbc960823d217875' 
  AND token = 'FxlDNJxrnctPQZ2b4/4a92nqNQZE6ztn8Tdikpp3TP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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