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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86319dc5e0414bc20ed9845c3b4cc3c78302a9f44ceb37a85e699e0f8204998' 
  AND token = 'zBUnmuC5Snuq/WaLpRBBfvaTyUk/HaQ+0VtSp/uCZvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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