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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '348f432cf6f9f842fdc00a5973b69e4fe62747d1c30ac6b9ce0e7ef84e4a19c3' 
  AND token = 'nZvX3E2bPfRixeC2EVwpI7BTP7BjUK9DkaPg8jQgask=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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