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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '321bfc848d6073f89d23ae1f79ac8b7cf3ebddfe80e35c77498f9d2a6033670c' 
  AND token = 'YDP6/LFqSzOY1ADc209zfVyD2N+ijZy+PATv+YZH+8w=' 
  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"
    }
  }
}