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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c093a31612e7621a5e60f752029eeda6e29fd2b97c25d2e8066fb01cd7a7ade5' 
  AND token = 'KKLQIpW3ukJFS+0FEA5KeUW0LRe8v8faStU7FEMvvy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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