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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9152c1422dc2ff1749b1d54f9d2aff52a685f18a0becd106642357d795589b19' 
  AND token = 'yTYo8DAzM0+1FPTqK73HQWLqDsaHLfOoOzfFoBD/60g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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