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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8727f36fcaa8f3051d9db5cd4bbaf3c90d5c13294123648fc0b7dc41f95b2836' 
  AND token = 'WqAV6t09gNlA64ZqEfLonw5w9qaSY+4jEmgfKegwfds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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