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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a0f9572c4a55e72d2dfa7cb972b2a5197f3ffaf04e969a86a863407b359fa6' 
  AND token = 'zdst4UMRSJyAUchWFXdP8l/8pnb9cGVCyTOZbkUnSyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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