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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3801eae3601dd9af5176de4f39c291f6e51f46297883be99255f8f779a460cf' 
  AND token = 'ylAYDDcz8B77LzIMaC1wnc8Kq9b7ERSl36H8wAbhp24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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