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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24bb9cf85adaa8d7e4e6611d5f98c683ecafefc846156b05fd5b7dcdd7d05a6e' 
  AND token = 'oOSmmbe1igG5weUXlokIMQmEjHB5T50dTv7f2+PFzHc=' 
  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"
    }
  }
}