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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c8205d7c6f18b8318668ed8b1e2a29bc93bb9c0eddd4e5eb5870389c5d05f1' 
  AND token = 'RBIDmBskMZydMsp+a/unhnw4GfkxePzY1LFeEi+mw2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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