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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc805425780e9b91eb5411bcb6edc83f133c33af16701b2aafbe995c4c7058a1' 
  AND token = '/L5+rakDgrjO86XRrZg4//OGZ0T7UQ/YBtcXI1IoN/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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