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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39fea00ca6912c8766be5cddc6fc3128c96054125cdfe4eb5bc93e59f346fc35' 
  AND token = 'dWywWfoVVtLdr/ts0at4MJ8R1RW+qVj4YMuBcxfb9kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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