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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53bd275795169d4033433f3e506530d009ccfe8ae48a4afa7cd5d7ad5ff5eb06' 
  AND token = 'SKC+kiYRK4i2a54Xcn3HBcFNRv7I489u19OGJthU5oU=' 
  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"
    }
  }
}