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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08071bb7cf85526ef7840a2a959279545414dbb69809c5ee0f1d969000e0430' 
  AND token = 'Bd9SgBqNKnES205/weX1BBvmY0QbdanriM9JlGWj1B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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