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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf553f9882bb0899faf08f50c16459ff5169e8c2b6eb1410576badcdc62b1ac5' 
  AND token = 'vUW/Hv4Kwzk09+04MkJNSC8GKvw8dA+dE9wD+3CpCw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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