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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18a4c88e840af46efd6d7ce188ddce4c8f691d496e3719a8e5d9d5197887c13' 
  AND token = 'SHFb+lM7su2XOxONzDA1HNTjiFyNdGGeyiX+t1BTyIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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