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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594f25de07cfaa5f1fbae51873255effd3053184b9b441f9d319ddb2ce62bf5b' 
  AND token = 'qJ8Rjc/40DQKy/6KDb0xkSIvGmcOCMIVNJ90kpmiWV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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