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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e3ff05de4d0dd89c265224378c5bd260c56863f87d7c2bc3cccfd0d58e5d5b' 
  AND token = '4aT9Cwd4pVxal/KDTGVEdk8E40t3zQPhDX3UwKQusCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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