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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfb2ffa46f73d67cd1552353c5008818d0e6361b07b3ac807d0455862d10236' 
  AND token = 'e5LQSwFSzUCA1xzzPgIG7v0K3VkM9stcZQ2rbPdX/5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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