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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c536141a58cc44a5c10b216e1d0f8e91c472a9202515dee6aecb33f044cd7f13' 
  AND token = 'yYUFGKjgW5Wyvtm3G/Lyy0DBvBVgEhaEa4CC/H1ABJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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