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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d3fb050ad6c26a570a71ff922a1cd8c06da2cf7d49e6522399530260b25c93' 
  AND token = 'q8z7ImlTDmwnwnLdxOubWD94mWZGk0iMXzFfkbrvnwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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