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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee035313d3a81d8c043119d5e4c9ca250c415b7971f6c79c16ef6b058790eb2c' 
  AND token = 'hCc2gVf099OBUreTWm4tjV/0oT8gwl5jIIocND8MrXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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