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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4fdca538b9097ed1490de119661bd64acea56a0a4af3b5533b6574a3b5ab5c2' 
  AND token = 'zHwR4Hf4SJBmc8TdgLDYkU13nMMghMB3PoILkRIR8zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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