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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233c888a1d299cb678abb3c4f8120cc96b614ceab41cb24a1613e0db72c2b641' 
  AND token = 'JeNpvgCjrWjCRLuBYfLDLpU6Y5LEXYwVzo7s4JSmV34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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