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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8665c800192e3a92c0f64f5b680f527f4451b35b3c6f02875a32bc28f1500909' 
  AND token = 'UYXMDz88oLTaojut23j7KSiMS/y8Y7seHHD66PFsZv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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