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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26cf9b33a22cc79e18be0c037812a2ba27334e5dfbb11db98e8dbc0a549b4b7' 
  AND token = '9orb/yk2E62Sj0DAXVKv36tLxGYM1wJEpl/o2T/OMOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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