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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f38316e2b8e9fc44a0b9ccff5f9709c6091cdd9edfe422158bce6975df70e8' 
  AND token = 'h17idfa9/GBUBChEXX2dSznpQYbXNn33XM2t9GoMLyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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