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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e75c0a2b0d6e5a0ba3f3b728238accf1f6a559016f83d07cd8da20bf45fc34' 
  AND token = '385flCTLdmxY3CrLNb8qn9HAOJJ4KoAb4PwxOH1l57A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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