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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a64c4114fddd9866da9cc39c0ecd8b810f3df02372fabb30c4315aac2d42bd' 
  AND token = 'dGzm0nngnq+4iOhmgcLx4ftpUtY6JNYbbUFeV2M/LJo=' 
  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"
    }
  }
}