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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6162e0b04e0abda1bc8218ef1585de7b6a7c2fbaa5e8198aba0e2ddd299c126' 
  AND token = '4EiDIOHyrpYdwYetKSrqXCjtgNMUYKNo8sh8EkaofqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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