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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392da7ed65a826a1b1c817337afcd46d2e54582d8b4cb2803db7ed6c92314f78' 
  AND token = 'cDoVY8dhZGEi0iwakv12CXrDf77ZF+PxXdq1M1nUO9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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