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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ce3491c60eb6e950223943c2c0269cc2ade3dbf30a826950bdb93c50d5d5e0' 
  AND token = 'iQwEG4cMjiMIHyr/8IQmmVBWTWlYsvys4Ail5qyK51Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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