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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690315533cdce522fed494f3be0412c4ae367907e29f18e3a74748782e9322a4' 
  AND token = 'cw/kCfylwaW3tkyKCeBjr7LypoX7+fMpgCgtR1CZX3g=' 
  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"
    }
  }
}