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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05df86aa07ec493e0de5c72f96292a53e08523c5825eb3e4c8829d62134c031d' 
  AND token = 'FVm0rRaSRILepF+VL6GkHiO9Tnlj85DRrlbW8Kdl73g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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