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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf707fb78061f743756b308e956608835816641db128dcee8ba46a36de78726' 
  AND token = 'G62/UUPDn+H2uVu8reHt2704x0+Q+CUSEjU737eIKvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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