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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8afcf75e42fb6a4008d02f82000b75b306f91b1a1e848287eaa67f6693556be5' 
  AND token = 'Wy0dfavGq9EVKUM8z8Qk8ysvkgzF0snMSMsQ2MWQ9fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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