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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b0f71356bc070d91635f0a6d80a8aae858ed9b919a66c5ad4ebc1841289974' 
  AND token = 'Qb44jCzqoFbL2D1/UeQJF3ztFTxRhD+ccNLZkG7ZOuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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