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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84adc9554ce4eb3d97051be4d0567fbb568c5254cc37c028a0b5bb46dd515fe' 
  AND token = '3sNVLU1BDe4V9v0I9BzNq7n/i3h2A/JKcB7RapPoX14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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