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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c3696a9fd27a5230680c9ce626cceec8a75a17a746c219b9a688f16b6dbd934' 
  AND token = 'aW+4O0Mtal0eX6oj6HHSdTWL6P78E29aeG8GvufEJUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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