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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732754b6c2417367f2599d3da62a2298711e215e9cd5051b241acd9b68dbf145' 
  AND token = 'LP+0eujU3lvQHpghdyqz5c0p6liDaM4yvNdNBF0oHP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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