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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a7a3a7909fd268e82b54ce3e61f19dd6054aa1513f0d8a898b4c6ce25cb831' 
  AND token = '7xrPY1lRhVUxmzF4ERf3kfW+Pi/HTTtsD5SO3URNOhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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