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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22c19213c7679f3161dd9a79b979e0a913c90f3cb70498d3cfd79c228dcf8add' 
  AND token = '0OzYzf+fjCYqez9YllF8mXIXSDKn00kgqRazudPo/tY=' 
  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"
    }
  }
}