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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c698577b79e9cc529db1100e5d3b6d4de2ed5cd1070fa46c4ec2c03fcb9045e' 
  AND token = 'li4WWtzmqrNQIK64L0Aem0aUvC4rYPstLBn0WHSF4uk=' 
  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"
    }
  }
}