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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9927c5782036a29440e8d74d9a556d9079e6161d1e9027a85a6d53f3528f6d94' 
  AND token = 'S5BBO9unYWlhLsCe79P9pQQKu1LdC/3KWL+c7qT+RSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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