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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc1d48e8ff3552a4c92b92adf82fffda9377f631244743aaeb5f503b83f3600' 
  AND token = 'pHYxeWvd5fqr0yZQ0SbN1x67Ngofrz5e532nzMA5F7g=' 
  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"
    }
  }
}