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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976177220b94ce6a2e86018d0cc27b5f4e8c72d49b01476202d3346569d0416e' 
  AND token = 'Jdra9K8Nw0XMf4U78IXqLO2psBov/XpaK+FgC/ecjnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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