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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a8a7d9e76092bbad7d2385db8ba705ec6ff255b260b8ee265b40ee7278d9a1' 
  AND token = 'Kkxt7L0zZHKITPNsBmSW86A2340PMlXgVb8chbc73VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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