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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85281fb964c01113c9ba8f2a29fd36f2fcac7428a6f5de560232f5f451930a2b' 
  AND token = '0095mdpAI7KOEWI/+pJM8JalnuMbb4QQNuX6+BY/gFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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