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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78f95c7f44255e55994fa439ef6ded05dddf63a8fb7eea5ebf47d23af4f0bed1' 
  AND token = '0/f3aZArp/cIcbU6A3OEvH/fm0Y30RgEZAaT78UH0eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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