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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac6bb03f6d4d19f9fb001996dc51b726a784f854724abc6f7f0027ef4291fa8' 
  AND token = 'Qe0C+8kyBrYDO0Yez7zU1mr5HGU25hswtv3zYnu8gG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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