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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7eb7550aaf915c63f89f31c881cfd39c3450098f8d916945107318e6514b82' 
  AND token = '1rrO3aLJJhGy8Tc4YpAIVawGiPJ8wdZ9D0oRRTBOU6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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